fix(wave3): copy crates/ into rust-builder (workspace members were omitted)

The shared rust-builder stage copied only src/rust + src/interfaces + benches,
but Cargo.toml's [workspace] members include crates/echidna-core{,-spark},
echidna-mcp, echidna-wire, typed_wasm. `cargo build` failed:
  failed to read `/build/crates/echidna-core/Cargo.toml`: No such file.

This stage was a byte-identical copy of the original nine Containerfiles, so
those images could never have built green either — corroborates the
stale-doc-drift finding (Wave-3 "done" was never build-verified).

Found by actually running `podman build` on all 9 targets (all failed fast at
this step before any expensive prover build).

Refs #53.

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

Author: hyperpolymath

.containerization/Containerfile.wave3

@@ -44,6 +44,11 @@ RUN rustup toolchain install nightly && rustup default nightly
 WORKDIR /build
 
 COPY Cargo.toml Cargo.lock ./
+# Workspace members: crates/* (echidna-core, -core-spark, -mcp, -wire,
+# typed_wasm) + src/interfaces/* + root pkg at src/rust. The original nine
+# Containerfiles omitted `crates/` — their rust-builder stage could never
+# have built green (workspace manifest references crates/echidna-core).
+COPY crates ./crates
 COPY src/rust ./src/rust
 COPY src/interfaces ./src/interfaces
 COPY benches ./benches